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Improved PCR assay for the specific detection and quantitation of Escherichia coli serotype O157 in water

  • Applied genetics and molecular biotechnology
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Abstract

Escherichia coli serotype O157 is still a major global healthcare problem. However, only limited information is now available on the molecular and serological detection of pathogenic bacteria. Therefore, the development of appropriate strategies for their rapid identification and monitoring is still needed. In general, the sequence analysis based on stx, slt, eae, hlyA, rfb, and fliC h7 genes is widely employed for the identification of E. coli serotype O157; but there have been critical defects in the diagnosis and identification of E. coli serotype O157, in that they are also present in other E. coli serogroups. In this study, NCBI-BLAST searches using the nucleotide sequences of the putative regulatory protein gene from E. coli O157:H7 str. Sakai found sequence difference at the serotype level. The specific primers from the putative regulatory protein gene were designed and investigated for their sensitivity and specificity for detecting the pathogen in environment water samples. The specificity of the primer set was evaluated using genomic DNA from 8 isolates of E. coli serotype O157 and 32 other reference strains. In addition, the sensitivity and specificity of this assay were confirmed by successful identification of E. coli serotype O157 in environmental water samples. In conclusion, this study showed that the newly developed quantitative serotype-specific PCR method is a highly specific and efficient tool for the surveillance and rapid detection of high-risk E. coli serotype O157.

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Acknowledgments

This study was performed with the support of “Research Program for Agricultural Science & Technology Development (Project no. PJ008612),” the National Academy of Agricultural Science, Rural Development Administration, Republic of Korea.

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Correspondence to Dong Suk Park.

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Cho, M.S., Joh, K., Ahn, TY. et al. Improved PCR assay for the specific detection and quantitation of Escherichia coli serotype O157 in water. Appl Microbiol Biotechnol 98, 7869–7877 (2014). https://doi.org/10.1007/s00253-014-5855-8

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  • DOI: https://doi.org/10.1007/s00253-014-5855-8

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